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EL171H is a semi-rigid, room temperature curing, flame retardant polyurethane resin system. EL171H is specifically designed for the cost effective encapsulation of a variety of low to medium voltage electrical and electronic applications. EL171H offers medium viscosity, flame retardancy to UL94-V0 and excellent adhesion to a wide range of substrates. EL171H is also resistant to UV, aqueous based cleaning chemicals, motor oil, lubricants and most dilute acids and alkalis.

Product may differ slightly in terms of colour, pack size and appearance

Product Overview

EL171H is a semi-rigid, room temperature curing, flame retardant polyurethane resin system. EL171H is specifically designed for the cost effective encapsulation of a variety of low to medium voltage electrical and electronic applications. EL171H offers medium viscosity, flame retardancy to UL94-V0 and excellent adhesion to a wide range of substrates. EL171H is also resistant to UV, aqueous based cleaning chemicals, motor oil, lubricants and most dilute acids and alkalis.

Technical Spec

Technical Data Sheets

Hardener Health & Safety Data Sheets

Resin Health & Safety Data Sheets

Data sheets and safety data sheets are temporarily unavailable online as they are currently being updated. Please contact support@robnor.co.uk to request data sheets

How To

A Guide to Processing and Curing

Usable life
This is the time normally in minutes that the mixed resin is ‘usable’.

Working life
This is the time normally in minutes that the mixed resin is ‘workable’.

Pot life
This is the time to double the initial mixed system viscosity.

Viscosity
Viscosity is the resistance to flow. A high viscosity resin has high resistance to flow e.g., treacle. A low viscosity resin has low
resistance to flow e.g. water.

Curing
Curing is the process by which resins react to produce a solid infusible mass. The reaction of resin and hardener usually
involves the liberation of heat called exotherm. This is generally controlled by careful formulation and the addition of fillers and
additives that suppress excessive heat build up. It is however dependant on the ambient temperature and the mass of material used. Smaller masses and lower ambient temperature will extend cure time and larger masses and warmer ambient temperatures will reduce cure time. Hotter temperatures may be used for faster cure but will result in higher post cure shrinkage and higher cure exotherm. Experimentation and testing is suggested to avoid side effects. For maximum properties a post cure may be required - call Robnor Technical Service Department for advice.

Please consult the technical data sheet before using Resin-Online products.

Post Curing
In many resins the performance of the system can be enhanced by a process called post curing. This involves a secondary
cure process over and above the normal conditions to provide enhanced performance. In general post curing will improve such properties as; chemical resistance, temperature stability, dimensional stability, voltage breakdown resistance, water resistance and increase glass transition temperature. Post curing is mainly used on epoxy systems but can also be used on some high performance polyurethanes to enhance them still further. In general post curing occurs at 10 – 20.C above the maximum expected service temperature.

Typical post curing (depending on system), may involve a normal cure plus:
16 hrs at 100.C or
8 hrs at 120.C or
4 hrs at 140.C or
2 hrs at 150.C

Price Bands

Where buying this product in bulk items will be charged at a reduced rate. Details of prices offered for order quantities follow.